Spray a 9"x13" pan lightly with unflavored oil to prevent sticking.
Add ½ cup cold water and 2 Tbsp (3 envelopes, approx 21g) gelatin into the bowl as you whisk lightly to incoporate it so it doesn't clump.
In a heavy saucepan, add remaining ½ cup cold water, 1 cup white sugar, 1 cup brown sugar, ½ cup caramel dip, ¾ tsp salt. Cook over low heat, stirring gently until sugar dissolved.
Increase heat to medium and boil without stirring until mixture reaches 240°F, about 12 minutes. As soon as it reaches the right temperature remove from the heat.
Begin whisking the bloomed gelatin on slow speed. Pour the sugar mixture over the gelatin bloom stirring until dissolved evenly. Then add the remaining sugar mixture.
Beat mixture on high speed until white, thick, and nearly tripled in volume. This should take approximately 6-8 minutes in a stand mixer, and roughly 10 minutes with a hand mixer.
Working quickly, spread mixture into the prepared baking pan and smooth with an oiled spatula.
Allow to stand, uncovered for at least 24 hours up to three days, depending on desired moisture content and texture.